RECOMENDACIÓN UIT-R BT.1616

Rec. UIT-R BT.1616 1 RECOMENDACIÓN UIT-R BT.1616 Formato de tren de datos para el intercambio de señales de audio, de datos y de vídeo comprimidas en formato DV por medio de interfaces que se ajustan a la Recomendación UIT-R BT.1381 (Cuestión UIT-R 12/6) (2003) La Asamblea de Radiocomunicaciones de la UIT, considerando a) que se han identificado aplicaciones en la producción y la posproducción de televisión profesional en las que la compresión de señales de vídeo en formato DV puede ofrecer ventajas de explotación y económicas respecto a las operaciones basadas en la interfaz digital en serie (SDI); b) que se han propuesto tres velocidades de transferencia de datos dentro del mismo grupo de compresión para dar servicio a diferentes aplicaciones (25 Mbit/s, 50 Mbit/s y 100 Mbit/s); c) que las tramas de muestreo para cada una de las tres aplicaciones son diferentes; d) que los elementos de audio, datos auxiliares y metadatos son parte integrante de esas aplicaciones; e) que esos elementos se multiplexan en un tren de datos único, para su transporte y posterior procesamiento; f) que para continuar el posprocesamiento y el almacenamiento, el intercambio de información se efectuará a través de interfaces que se ajusten a la Recomendación UIT-R BT.1381; g) que para la interconexión de equipos de definición normal y de alta definición, el UIT-R recomienda que se utilicen las Recomendaciones UIT-R BT.656 y UIT-R BT.1120 respectivamente; h) que con ese objeto, se debe dar un formato al tren de datos complejos antes de su inserción en la interfaz mencionada; j) que este formato también debe describir los parámetros necesarios para la transmisión en modos más rápidos que el tiempo real, recomienda 1 que para las aplicaciones de producción y posproducción de televisión profesional que utilizan la compresión basada en DV, se dé un formato a los elementos integrantes, conforme a la Norma «Data Stream Format for the Exchange of DV-Based Audio, Data and Compressed Video over a Serial Data Transport Interface». NOTA 1 La Norma comprende una referencia normativa a la Norma SMPTE 296M-2001 «1280 720, Progressive Image Sample Structure Analog and Digital Representation and Analog Interface». Los siguientes formatos indicados en el Cuadro 1 de la Norma SMPTE 296M, no deberán considerarse parte de la presente Recomendación.

2 Rec. UIT-R BT.1616 Punto del Cuadro 1 Nomenclatura del sistema Velocidad de trama 3 1280 720/50 50 6 1 280 720/25 25 7 1280 720/24 24 8 1280 720/23,98 24/1,001 Resumen de la Norma Esta Norma define el formato del tren de datos para el intercambio síncrono de señales basadas en formato DV de audio, de datos y de vídeo comprimidas a través de una interfaz de transporte de datos en serie (SDTI). Comprende la transmisión de paquetes de audio, de datos de subcódigo y de vídeo comprimidos asociados con estructuras de datos en formato DV a velocidades de 25 Mbit/s, 50 Mbit/s y 100 Mbit/s para los sistemas 525/60i, 625/50i, 1080/60i, 1080/50i y 720/60p, incluida la transmisión más rápida que en tiempo real. Esta Norma no comprende el tren de datos de una estructura en formato DV tal como se define en las Normas CEI 61834 y SMPTE 322M. El espacio de la SDTI no utilizado por un tren de datos conforme a esta Norma, se puede utilizar para la transmisión de datos que no sean los que representan las señales de audio, de datos y de vídeo comprimidas en formato DV. NOTA 1 Las Normas y 296M-2001 figuran en los Anexos 1 y 2. Las Normas SMPTE 321M-2002 y 296M-2001 se refieren únicamente a las versiónes 2002 y 2001 respectivamente, que son las aprobadas el 3.05.03 por las Administraciones de los Estados Miembros de la UIT en cumplimiento de lo dispuesto en la Resolución UIT-R 1-3. En virtud del acuerdo entre la UIT y la SMPTE, la SMPTE ha facilitado y autorizado la utilización de estas versiones y el UIT-R ha aceptado su inclusión en la presente Recomendación. Cualquier versión posterior de las Normas SMPTE 321M y 296M que no hayan sido aceptadas y aprobadas por la Comisión de Estudio 6 de Radiocomunicaciones no formará parte de la presente Recomendación. Las últimas versiones de los Documentos de la SMPTE se pueden consultar en el sitio web de la SMPTE: http://www.smpte.org/.

Rec. UIT-R BT.1616 3 Anexo 1 SMPTE STANDARD Revision of SMPTE 321M-1999 for Television Data Stream Format for the Exchange of DV-Based Audio, Data and Compressed Video over a Serial Data Transport Interface 1 Scope Page 1 of 24 pages 1.1 This standard defines the format of the data steam for the synchronous exchange of DV-based audio, data, and compressed video (whose data structure is defined in SMPTE 314M and SMPTE 370M) over the interface defined in SMPTE 305M. It covers the transmission of audio, subcode data, and compressed video packets associated with DV-based 25- and 50-Mb/s data structures including faster-than-real-time transmission, and 100-Mb/s data structures for 525/60 SDTI and 625/50 SDTI systems. 1.2 This standard does not include the data stream of a DV-compressed structure as defined in SMPTE 322M. 1.3 Space within SMPTE 305M not used by a data stream conforming to this standard may be used for the transmission of data other than those representing DV-based audio, data, and compressed video. 1.4 In this standard, the 60-Hz system refers to the field frequency 59.94-Hz system and the 50-Hz system refers to the field frequency 50.0-Hz system. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. SMPTE 274M-1998, Television 1920 x 1080 Scanning and Analog and Parallel Digital Interfaces for Multiple Picture Rates SMPTE 296M-2001, Television 1280 x 720 Progressive Image Sample Structure Analog and Digital Representation and Analog Interface SMPTE 305.2M-2000, Television Serial Data Transport Interface (SDTI) SMPTE 314M-1999, Television Data Structure for DV-Based Audio, Data and Compressed Video 25 and 50 Mb/s SMPTE 370M, Television Data Structure for DV-Based Audio, Data and Compressed Video at 100 Mb/s 1080/60i, 1080/50i, 720/60p Copyright 2002 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 Approved March 28, 2002

4 Rec. UIT-R BT.1616 3 Identification within the serial data transport interface (SDTI) 3.1 SDTI header packet data The header packet data words of the serial data transport interface (SDTI) associated with this data stream format shall conform to SMPTE 305M. When the SDTI interface is transporting a data stream conforming to this standard, the block type word within the SDTI header packet shall have the value 173h for transported data contained in fixed-size blocks when ECC (error correction code) is used and the value 233h when ECC is not used. 3.2 Payload The payload is composed of consecutive fixed-size blocks (see figure 1). The SDTI data type word shall identify the data type of this payload with the value 221h. Ancillary data Payload E A V Header Data Space S A V Fixed block Fixed block Fixed block Fixed block Space 1 word 170 words (from SMPTE 305M, table 2) SDTI data type Stream block word 0 1 2 3 4 5 6 7 8 9 85 86 87 88 89 169 Reserved data ST TT DIF block ID DIF block data DIF block ID DIF block data ECC (3 words) (3 words) (77 words) (3 words) (77 words) (4 words) Signal type (2 words) Transmission type (1 words) Figure 1 Stream block format Page 2 of 24 pages

Rec. UIT-R BT.1616 5 4 Stream block format The stream block format is shown in figure 1. The length of each stream block is 170 words, including a secondary header, two DIF (digital interface) block IDs, two DIF block data (of stream data), and an ECC block. The secondary header contains reserved data words, signal type words, and a transmission type word. The complete word structure of the stream block for a compressed video data stream is defined below: Reserved data: Signal type: Transmission type: DIF block ID: DIF block data: DIF block ID: DIF block data: ECC: 3 words 2 words 1 word 3 words 77 words 3 words 77 words 4 words 4.1 Reserved data words The reserved data words shall consist of 3 words and be positioned at the start of the stream block. The default value for the reserved data is 200h. 4.2 Signal type words The signal type word (ST) mapping is shown in figure 2. The signal type words shall consist of two words. The first word of ST (word 3) includes the specific type of video frame ID (STVF ID). The second word of ST (word 4) includes the field/frame frequency flag (FF), the DIF structure format, the DIF valid flag (DVF), the frame sequence number flag (FSNF), the transmission rate flag (TRF), and reserved bits. B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 word 3 EP EP Reserved STVF ID word 4 EP EP FF DIF structure Re DVF FSNF TRF Figure 2 Signal type (ST) word mapping Word 3 of ST The STVF ID shows information mainly related to pictures that have been 3:2 pull-down converted from 480 line/29.98 frame rate progressive pictures. In the case of the 25- and 50-Mb/s structure for the 525/60 SDTI system, the following applies: Bits B7 through B3 are reserved bits and shall be set to 00000b as default values. Bits B2 through B0 indicate the specific type of video frame ID which shows the type of the converted picture with the following values: Page 3 of 24 pages

6 Rec. UIT-R BT.1616 B2 B1 B0 Original Converted 0 0 0 : 480i / 29.97 -> No change 0 0 1 : 480p / 29.97 -> Segmented frame (see note) 0 1 0 : 480p / 23.98 -> No field sequence ID (3:2 pull down) 0 1 1 : 480p / 23.98 -> A frame (3:2 pull down) 1 0 0 : 480p / 23.98 -> B frame (3:2 pull down) 1 0 1 : 480p / 23.98 -> C frame (3:2 pull down) 1 1 0 : 480p / 23.98 -> D frame (3:2 pull down) 1 1 1 : 480p / 23.98 -> E frame (3:2 pull down) NOTE Odd lines of 480p/29.97 are mapped to the first field and even lines of 480p/29.97 are mapped to the second field. In the case of the 100-Mb/s structure for the 525/60 SDTI system and in the case of the 25-, 50-, and 100-Mb/s structures for the 626/50 SDTI system, the following applies: All values of bits B7 through B0 are set to 00h as default values. Bit B8 of word 3 is equal to the even parity of B7 through B0. Bit B9 of word 3 is equal to the complement of B8. Word 4 of ST Bit B7 indicates the field frequency of the serial digital interface (SDTI) with the following values: B7 0 : 60 Hz (59.94 Hz) 1 : 50 Hz Bits B6 through B4 indicate the DIF structure with the following values: B6 B5 B4 0 0 0 : Reserved 0 0 1 : Reserved 0 1 0 : Reserved 0 1 1 : 25-Mb/s structure 1 0 0 : Reserved 1 0 1 : 50-Mb/s structure 1 1 0 : 100-Mb/s structure 1 1 1 : Reserved Bit B3 is the reserved bit and shall be set to 0b as the default value. Bit B2 is the DIF valid flag (DVF) and indicates the validity of the DIF data mapped into SDTI. B2 0 : Invalid 1 : Valid Bit B1 is the frame sequence number flag (FSNF) and indicates the validity of the frame sequence number (see 4.3) with the following values: B1 0 : Valid 1 : Invalid Page 4 of 24 pages

Rec. UIT-R BT.1616 7 Bit B0 is the transmission rate flag (TRF) and indicates the validity of the transmission rate (see 4.3) with the following values: B0 0 : Valid 1 : Invalid Bit B8 is equal to the even parity of B7 through B0. Bit B9 is equal to the complement of B8. 4.3 Transmission type word The transmission type word (TT) mapping is shown in figure 3. The transmission type word shall consist of one word including the frame sequence number and the transmission rate. B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 word 5 EP EP Frame sequence number Transmission rate Figure 3 Transmission type (TT) word mapping Bits B7 through B4 indicate the frame sequence number with the following values: 0h : 1 1h : 2 Fh : 16 The frame sequence number identifies frames multiplexed within an SDTI frame. Bits B3 through B0 indicate the transmission rate with the following values: 0h : 1 x (normal transmission rate) (see note) 1h : 2 x 2h : 3 x 3h : 4 x 4h : 5 x 5h : 6 x 6h : 7 x 7h : 8 x 8h - Eh : Reserved Fh : 16 x NOTE The multiple of the normal transmission rate is represented by x. The normal transmission rate corresponding to normal reproduction of the television picture is 1 x. Bit B8 is equal to the even parity of B7 through B0. Bit B9 is equal to the complement of B8. Page 5 of 24 pages

8 Rec. UIT-R BT.1616 4.4 DIF block ID words The DIF block ID (ID0-2) shall consist of three words contained in bits A23 through A0 as shown in figure 4. The lower 8-bit portion of these three words is specified in SMPTE 314M and SMPTE xxxm. B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 word 6 and 86 EP1 EP1 A7 A6 A5 A4 A3 A2 A1 A0 word 7 and 87 EP2 EP2 A15 A14 A13 A12 A11 A10 A9 A8 word 8 and 88 EP3 EP3 A23 A22 A21 A20 A19 A18 A17 A16 Figure 4 Mapping of DIF block ID EP1 is equal to the even parity of bits A7 through A0; EP2 is equal to the even parity of bits A15 through A8; EP3 is equal to the even parity of bits A23 through A16; and EP1 is equal to the complement of EP1; EP2 is equal to the complement of EP2; EP3 is equal to the complement of EP3. 4.5 DIF block data words The DIF block data shall consist of 77 words. The lower 8 bits of each DIF block word represent the DIF block data, as specified in SMPTE 314M and SMPTE xxxm; the higher 2 bits are parity data. Bits B7 through B0 are DIF block data; Bit B8 is equal to the even parity of B7 through B0. Bit B9 is equal to the complement of B8. 4.6 Error correction code (ECC) words Bits B7 through B0 of the words within a stream block (including reserved data words, the ST word, the TT word, and all words of the DIF block ID and DIF block data) are optionally protected by an error correction code (ECC). The ECC shall consist of four words and be inserted at the end of the stream block. The error correction code is a (170, 166) Reed-Solomon code in GF(256), whose field generator polynomial is shown as: P(x) = X 8 + X 4 + X 3 + X 2 + 1 where X i are place-keeping variables in GF(2), the binary field. The generator polynomial of the code in GF(256) is: G(x) = (x+α)(x+α 2 )(x+α 3 )(x+α 4 ) where α is given by 2h in GF(256). Page 6 of 24 pages

Rec. UIT-R BT.1616 9 When the value of the block type in the SDTI header (see 3.1) is 173h, the Reed-Solomon code shall be contained in C31 through C0 as shown in figure 5. When the value of the block type is 233h, the ECC shall have the fixed value 200h. B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 word 166 EP1 EP1 C7 C6 C5 C4 C3 C2 C1 C0 word 167 EP2 EP2 C15 C14 C13 C12 C11 C10 C9 C8 word 168 word 169 EP3 EP3 C23 C22 C21 C20 C19 C18 C17 C16 EP4 EP4 C31 C30 C29 C28 C27 C26 C25 C24 Figure 5 Mapping of ECC EP1 is equal to the even parity of bits C7 through C0; EP2 is equal to the even parity of bits C15 through C8; EP3 is equal to the even parity of bits C23 through C16; EP4 is equal to the even parity of bits C31 through C24; and EP1 is equal to the complement of EP1; EP2 is equal to the complement of EP2; EP3 is equal to the complement of EP3; EP4 is equal to the complement of EP4. 5 Transmission order The transmission order within one frame for 25-, 50-, and 100-Mb/s DV-based compression structures consisting of DIF blocks is shown in figures 6, 7, 8, and 9. In the 100-Mb/s structure, one frame is carried in four channels, which are transmitted in sequence from the first channel to the fourth channel one after another. In the 50-Mb/s structure, each frame is carried in two channels, which are transmitted in sequence one after another. In the 25-Mb/s structure, only a single channel is used. Each channel consists of 10 DIF sequences in the 60-Hz system or 12 DIF sequences in the 50-Hz system. DIF sequences within a frame are transmitted in a DIF sequence order from 0 to n-1. Each DIF sequence is composed of 150 DIF blocks. DIF blocks within a DIF sequence are transmitted sequentially from DIF block 0 to 149. Page 7 of 24 pages

10 Rec. UIT-R BT.1616 Data in one frame First channel Second channel Third channel Fourth channel DIF sequences DIF sequence 0,0 DIF sequence 1,0 DIF sequence n-1,0 DIF sequence 0,3 DIF sequence 1,3 DIF sequence n-1,3 DIF sequence number Structure of a DIF sequence Header section Subcode section VAUX section Transmission order Audio & video section DIF channel number DIF blocks H0,0 SC0,0 SC1,0 VA0,0 VA1,0 VA2,0 A0,0 V 0,0 V132,0 V133,0 V134,0 Byte position number 0 1 2 3 - - - - - - - - - - - - - - - - - - - - - - - - 79 DIF block number DIF channel number Structure of a DIF block ID Data Note n = 10 for 60 Hz system n = 12 for 50 Hz system DIF channel number = 0, 1, 2, 3 Figure 6 Transmission order in one frame for the 100-Mb/s structure Page 8 of 24 pages

Rec. UIT-R BT.1616 11 Data in one frame First channel Second channel DIF sequences DIF sequence 0,0 DIF Sequence 1,0 DIF sequence n-1,0 DIF sequence 0,1 DIF sequence 1,1 DIF sequence n-1,1 DIF sequence number FSC Structure of a DIF sequence Header section Subcode section VAUX section Transmission order Audio & video section DIF blocks H0,0 SC0,0 SC1,0 VA0,0 VA1,0 VA2,0 A0,0 V 0,0 V132,0 V133,0 V134,0 Byte position number 0 1 2 3 - - - - - - - - - - - - - - - - - - - - - - - 79 DIF block number FSC Structure of a DIF block ID Data Note n = 10 for 525/60 system n = 12 for 625/50 system FSC : First/second channel Figure 7 Transmission order in one frame for the 50-Mb/s structure Page 9 of 24 pages

12 Rec. UIT-R BT.1616 Data in one frame DIF sequences DIF sequence 0,0 DIF sequence 1,0 DIF sequence n-1,0 DIF sequence number FSC Structure of a DIF sequence Header section Subcode section VAUX section Audio & video section Transmission order DIF blocks H0,0 SC0,0 SC1,0 VA0,0 VA1,0 VA2,0 A0,0 V 0,0 V132,0 V133,0 V134,0 Structure of a DIF block Byte position number 0 1 2 3 - - - - - - - - - - - - - - - - - - - - - - - 79 ID Data Note DIF block number FSC n = 10 for 525/60 system n = 12 for 625/50 system FSC : First/second channel Figure 8 Transmission order in one frame for the 25-Mb/s structure Page 10 of 24 pages

Rec. UIT-R BT.1616 13 Transmission order DIF blocks H0,i SC0,i SC1,i VA0,i VA1,i VA2,i A0,i V0,i V1,i V2,i V3,i V4,i V5,i V6,i V7,i V8,i V9,i V10,i V11,i V12,i V13,i V14,i A1,i V15,i V16,i V17,i V18,i V19,i V20,i V21,i V22,i V23,i V24,i V25,i V26,i V27,i V28,i V29,i A2,i V30,i V31,i V32,i V33,i V34,i V35,i V36,i V37,i V38,i V39,i V40,i V41,i V42,i V43,i V44,i A3,i V45,i V46,i V47,i V48,i V49,i V50,i V51,i V52,i V53,i V54,i V55,i V56,i V57,i V58,i V59,i A4,i V60,i V61,i V62,i V63,i V64,i V65,i V66,i V67,i V68,i V69,i V70,i V71,i V72,i V73,i V74,i A5,i V75,i V76,i V77,i V78,i V79,i V80,i V81,i V82,i V83,i V84,i V85,i V86,i V87,i V88,i V89,i A6,i V90,i V91,i V92,i V93,i V94,i V95,i V96,i V97,i V98,i V99,i V100,i V101,i V102,i V103,i V104,i A7,i V105,i V106,i V107,i V108,i V109,i V110,i V111,i V112,i V113,i V114,i V115,i V116,i V117,i V118,i V119,i A8,i V120,i V121,i V122,i V123,i V124,i V125,i V126,i V127,i V128,i V129,i V130,i V131,i V132,i V133,i V134,i NOTES DIF block number FSC or DIF channel number i : FSC i=0 for 25-Mb/s structure FSC i=0,1 for 50-Mb/s structure DIF channel number i=0,1,2,3 for 100-Mb/s structure H0,i : DIF block in header section SC0,i to SC1,i : DIF blocks in subcode section VA0,i to VA2,i : DIF blocks in VAUX section A0,i to A8,i : DIF blocks in audio section V0,i to V134,i : DIF blocks in video section The DIF channel number is defined by FSC and FSP as described in table 5 of SMPTE 370M. Figure 9 Transmission order in a DIF sequence Page 11 of 24 pages

14 Rec. UIT-R BT.1616 6 Mapping structure The mapping structure defines where SDTI stream blocks are mapped into SDTI frames. An SDTI data block of the fixed-block variety (as used by this standard) is based on one stream block; the stream block in turn includes two DIF blocks and associated words, as shown in figure 1. In the 525/60 SDTI system, the compressed video data stream within an SDTI frame is composed of 750 SDTI data blocks (1500 DIF blocks) for the 25-Mb/s compression structure or 1500 SDTI data blocks (3000 DIF blocks) for the 50-Mb/s structure or 3000 SDTI data blocks (6000 DIF blocks) for the 100-Mb/s structure. In the 625/50 SDTI system, the compressed video data stream within an SDTI frame is composed of 900 SDTI data blocks (1800 DIF blocks) for the 25-Mb/s compression structure or 1800 SDTI data blocks (3600 DIF blocks) for the 50-Mb/s structure or 3600 SDTI data blocks (7200 DIF blocks) for the 100-Mb/s structure. 6.1 Channel unit The channel unit structure is shown in figures 10 and 11. A channel unit is a series of SDI raster lines into which SDTI data blocks are mapped. In the case of 25-Mb/s structure transmission, a channel unit is composed of the SDTI data blocks of one frame (see 6.2 for the 50- and 100-Mb/s structures). A channel unit is thus composed of 750 SDTI data blocks for the 525/60 SDTI system or 900 SDTI data blocks for the 625/50 SDTI system. In the 525/60 SDTI system, a channel unit occupies 94 lines in the 270-Mb/s interface or 69 lines in the 360-Mb/s interface; in the 625/50 SDTI system, a channel unit occupies 113 lines in the 270-Mb/s interface or 82 lines in the 360-Mb/s interface. The remaining payload space within a channel unit should be filled with blocks with their value set to the invalid type number 100 h, as defined in SMPTE 305M. 6.2 Mapping rules The mapping rules are as follows: - Channel units consist of contiguous lines with no gaps and shall not use lines 10, 11, 273, or 274 in the 525/60 SDTI system, or lines 6, 7, 319, or 320 in the 625/50 SDTI system. The start lines in which a channel unit can be mapped are shown in table 1. A channel unit shall be completely contained within an SDI video field. Multiple channel units shall not be mapped into the same line and shall not be interleaved with each other. For faster-than-real-time transmission, the mapping order of channel units shall be in time sequence. Page 12 of 24 pages

Rec. UIT-R BT.1616 15 Ancillary data space Payload (1440 words) Line 1 Line 2 Line K 94 lines 171 words SDTI block 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 736 737 738 739 740 741 742 743 744 745 746 747 748 749 72 words Channel unit Line 524 Line 525 Note K = 21, 115, 284, 378 a) for 270 Mb/s system Ancillary data space Payload (1920 words) Line 1 Line 2 Line K 69 lines 171 words SDTI block 0 1 2 3 4 5 6 7 11 12 13 14 15 16 17 18 22 23 24 25 26 27 28 29 30 31 32 737 738 739 740 741 742 743 744 745 746 747 748 749 8 9 10 19 20 21 39 words Channel unit Line 524 Line 525 Note K = 21, 90, 159, 284, 353, 422 b) for 360 Mb/s system Figure 10 Channel unit mapping for the 25-Mb/s structure (525/60 SDTI system) Page 13 of 24 pages

16 Rec. UIT-R BT.1616 Ancillary data space Payload (1440 words) Line 1 Line 2 Line K 113 lines 171 words SDTI block 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 888 889 890 891 892 893 894 895 896 897 898 899 72 words Channel unit Line 624 Line 625 Note K = 23, 136, 336, 449 a) for 270 Mb/s system Ancillary data space Payload (1920 words) Line 1 Line 2 Line K 82 lines 171 words SDTI block 0 1 2 3 4 5 6 7 11 12 13 14 15 16 17 18 8 9 10 19 20 21 22 23 24 25 26 27 28 29 30 31 32 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 39 words Channel unit Line 624 Line 625 Note K = 23, 105, 187, 336, 418, 500 b) for 360 Mb/s system Figure 11 Channel unit mapping for the 25-Mb/s structure (625/50 SDTI system) Page 14 of 24 pages

Rec. UIT-R BT.1616 17 Table 1 Start lines of channel units 525/60 SDTI system 625/50 SDTI system 270-Mb/s interface 21, 115, 284, 378 360-Mb/s interface 21, 90, 159, 284, 353, 422 270-Mb/s interface 23, 136, 336, 449 360-Mb/s interface 23, 105, 187, 336, 418, 500 In the case of synchronized multichannel unit transmission, the mapping of channel units shall be in fixed positions as shown in figures 12 and 13. One SDTI frame shall contain 4-channel units with the 270-Mb/s interface or 6-channel units with the 360-Mb/s interface. In the case of 50-Mb/s structure transmission, one frame shall use two adjacent channel units as shown in figures 14 and 15. The first part of one frame shall use the first channel unit and the second part of the frame shall use the second channel unit. In the 525/60 system, 1500 SDTI data blocks are mapped into 188 lines for the 270-Mb/s interface or into 138 lines for the 360-Mb/s interface. In the 625/50 system, 1800 SDTI data blocks are mapped into 226 lines for the 270-Mb/s interface or into 164 lines for the 360-Mb/s interface. In the case of 100-Mb/s structure transmission, one frame shall use four adjacent channel units as shown in figures 16 and 17. The first part of one frame shall use the first channel unit, the second part of the frame shall use the second channel unit, the third part of the frame shall use the third channel unit, and the fourth part of the frame shall use the fourth channel unit. In the 525/60 SDTI system, 3000 SDTI data blocks are mapped into 376 lines for the 270-Mb/s interface or into 276 lines for the 360-Mb/s interface. In the 625/50 SDTI system, 3600 SDTI data blocks are mapped into 452 lines for the 270-Mb/s interface or into 328 lines for the 360-Mb/s interface. In the case of faster-than-real-time transmission, SDTI data blocks are mapped into adjacent multiple channel units. Page 15 of 24 pages

18 Rec. UIT-R BT.1616 Ancillary data space Payload (1440 words) Line 1 Field 1 21 114 115 208 94 lines Channel unit 0 94 lines Channel unit 1 Field 2 284 377 378 471 94 lines Channel unit 2 94 lines Channel unit 3 Line 525 a) for 270 Mb/s system Ancillary data space Payload (1920 words) Line 1 Field 1 21 89 90 158 159 227 69 lines Channel unit 0 69 lines Channel unit 1 69 lines Channel unit 2 Field 2 284 352 353 421 422 490 Line 525 69 lines Channel unit 3 69 lines Channel unit 4 69 lines Channel unit 5 b) for 360 Mb/s system Figure 12 Channel unit mapping in a synchronized multichannel unit transmission (525/60 SDTI system) Page 16 of 24 pages

Rec. UIT-R BT.1616 19 Ancillary data space Payload (1440 words) Line 1 Field 1 23 135 136 248 113 lines Channel unit 0 113 lines Channel unit 1 Field 2 336 448 449 561 113 lines Channel unit 2 113 lines Channel unit 3 Line 625 a) for 270 Mb/s system Ancillary data space Payload (1920 words) Line 1 23 104 105 Field 1 186 187 268 82 lines Channel unit 0 82 lines Channel unit 1 82 lines Channel unit 2 336 417 418 Field 2 499 500 581 Line 525 82 lines Channel unit 3 82 lines Channel unit 4 82 lines Channel unit 5 b) for 360 Mb/s system Figure 13 Channel unit mapping in a synchronized multichannel unit transmission (625/50 SDTI system) Page 17 of 24 pages

20 Rec. UIT-R BT.1616 Ancillary data space Payload (1440 words) Line 1 Line 2 Line K 94 lines 188 lines Line L 94 lines 171 words SDTI block 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 744 745 746 747 748 749 750 751 752 753 754 755 756 757 72 words 758 759 760 761 762 763 764 765 1494 1495 1496 1497 1498 1499 Channel unit Line 524 Line 525 Note (K, L) = (21, 115), (115, 284), (284, 378) a) for 270 Mb/s system Ancillary data space Payload (1920 words) Line 1 Line 2 Line K 69 lines 171 words SDTI block 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 39 words 138 lines 69 lines Line L 748 749 750 751 752 753 754 755 756 757 758 761 762 763 764 765 766 767 768 769 759 770 760 771 Channel unit 1498 1499 Note (K, L) = (21, 90), (90, 159), (159, 284), (284, 353), (353, 422) Line 524 Line 525 b) for 360 Mb/s system Figure 14 Channel unit mapping for the 50-Mb/s structure (525/60 SDTI system) Page 18 of 24 pages

Rec. UIT-R BT.1616 21 Ancillary data space Payload (1440 words) Line 1 Line 2 Line K 113 lines 226 lines Line L 113 lines 171 words SDTI block 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 1796 1797 1798 1799 72 words Channel unit Line 624 Line 625 Note (K, L) = (23, 136), (136, 336), (336, 449) a) for 270 Mb/s system Ancillary data space Payload (1920 words) Line 1 Line 2 Line K 171 words SDTI block 0 1 2 3 4 5 6 7 8 9 10 39 words 11 12 13 14 15 16 17 18 19 20 21 82 lines 164 lines Line L 891 892 893 894 895 896 897 898 900 901 902 903 904 905 906 907 911 912 913 914 915 916 917 918 899 908 919 909 920 910 921 Channel unit 82 lines Line 624 Line 625 1791 1792 1793 1794 1795 1796 1797 1798 1799 Note (K, L) = (23, 105), (105, 187), (187, 336), (336, 418), (418, 500) b) for 360 Mb/s system Figure 15 Channel unit mapping for the 50-Mb/s structure (625/50 SDTI system) Page 19 of 24 pages

22 Rec. UIT-R BT.1616 Ancillary data space Payload (1440 words) Line 1 Line 2 Line 21 94 lines 188 lines Line 115 94 lines Line284 94 lines 188 lines Line 398 94 lines 171 words SDTI block 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 1494 1495 1496 1497 1498 1499 72 words 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2994 2995 2996 2997 2998 2999 Channel unit Line 524 Line 525 a) for 270 Mb/s system Figure 16a Channel unit mapping for the 100-Mb/s structure (525/60 SDTI system) Page 20 of 24 pages

Rec. UIT-R BT.1616 23 Ancillary data space Payload (1920 words) Line 1 Line 2 Line K 69 lines 171 words SDTI block 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 39 words 207 lines 69 lines Line L 748 749 750 751 752 753 754 755 756 757 758 761 762 763 764 765 766 767 768 769 759 770 760 771 69 lines Line M 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 2248 2249 1520 1521 Channel unit 69 lines Line N 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2998 2999 2270 2271 Line 524 Line 525 Note (K, L, M, N) = (21, 90, 159, 284) (90, 159, 284, 353) (159, 284, 353, 422) b) for 360 Mb/s system Figure 16b Channel unit mapping for the 100-Mb/s structure (525/60 SDTI system) Page 21 of 24 pages

24 Rec. UIT-R BT.1616 Ancillary data space Payload (1440 words) Line 1 Line 2 171 words SDTI block 72 words Line 23 113 lines 226 lines Line 136 113 lines 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 1796 1797 1798 1799 Channel unit Line 336 113 lines 226 lines Line 449 113 lines 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2810 2811 2812 2813 2814 2815 3596 3597 3598 3599 Line 624 Line 625 a) for 270 Mb/s system Figure 17a Channel unit mapping for the 100-Mb/s structure (625/50 SDTI system) Page 22 of 24 pages

Rec. UIT-R BT.1616 25 Ancillary data space Payload (1920 words) Line 1 Line 2 Line K 171 words SDTI block 0 1 2 3 4 5 6 7 8 9 10 39 words 11 12 13 14 15 16 17 18 19 20 21 82 lines Line L 246 lines 82 lines Line M 82 lines 891 892 893 894 895 896 897 898 900 901 902 903 904 905 906 907 911 912 913 914 915 916 917 918 899 908 919 909 920 910 921 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 2691 2692 2693 2694 2695 2696 2697 2698 2699 Channel unit 82 lines Line N 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 3591 3592 3593 3594 3595 3596 3597 3598 3599 Note (K, L, M, N) = (23, 105, 187, 336) (105, 187, 336, 418) (187, 336, 418, 500) Line 624 Line 625 b) for 360 Mb/s system Figure 17b Channel unit mapping for the 100-Mb/s structure (625/50 SDTI system) Page 23 of 24 pages

26 Rec. UIT-R BT.1616 Annex A (informative) Abbreviations and acronyms SDI: SDTI: ECC: DIF: ST: STVF: FF: DVF: FSNF: TRF: TT: Serial digital interface Serial data transport interface Error correction code Digital interface Signal type Signal type of video frame Field/frame frequency flag DIF valid flag Frame sequence number flag Transmission rate flag Transmission type Annex B (informative) Bibliography ANSI/SMPTE 125M-1995, Television Component Video Signal 4:2:2 Bit-Parallel Digital Interface ANSI/SMPTE 244M-1995, Television System M/NTSC Composite Video Signals Bit-Parallel Digital Interface ANSI/SMPTE 259M-1997, Television 10-Bit 4:2:2 Component and 4fsc Composite Digital Signals Serial Digital Interface ANSI/SMPTE 267M-1995, Television Bit-Parallel Digital Interface Component Video Signal 4:2:2 16 9 Aspect Ratio SMPTE 291M-1998, Television Ancillary Data Packet and Space Formatting SMPTE 294M-2001, Television 720 483 Active Line at 59.94-Hz Progressive Scan Production Bit-Serial Interfaces SMPTE 306M-2002, Television Digital Recording 6.35-mm Type D-7 Component Format Video Compression at 25 Mb/s and 50 Mb/s 525/60 and 625/50 SMPTE 316M-1999, Television Digital Recording 12.65-mm Type D-9 Component Format Video Compression 525/60 and 625/50 SMPTE 322M-1999, Television Format for Transmission of DV Compressed Video, Audio and Data Over a Serial Data Transport Interface IEC 61834-1 (1998-08), Recording Helical-Scan Digital Video Cassette Recording System Using 6,35 mm Magnetic Tape for Consumer Use (525-60, 625-50, 1125-60 and 1250-50 Systems) Part 1: General Specifications IEC 61834-2 (1998-08), Recording Helical-Scan Digital Video Cassette Recording System Using 6,35 mm Magnetic Tape for Consumer Use (525-60, 625-50, 1125-60 and 1250-50 Systems) Part 2: SD Format for 525-60 and 625-50 Systems Page 24 of 24 pages

Rec. UIT-R BT.1616 27 Anexo 2 SMPTE STANDARD SMPTE 296M-2001 Revision of ANSI/SMPTE 296M-1997 for Television 1280 720 Progressive Image Sample Structure Analog and Digital Representation and Analog Interface Page 1 of 14 pages Contents 1 Scope 2 Normative references 3 General 4 Timing 5 System colorimetry 6 Raster structure 7 Digital representation 8 Digital timing reference sequences (SAV, EAV) 9 Ancillary data 10 Bit-parallel interface 11 Analog sync 12 Analog interface Annex A Production aperture Annex B Pre- and post-filtering characteristics Annex C Bibliography 1 Scope 1.1 This standard defines a family of progressive image sample systems for the representation of stationary or moving two-dimensional images sampled temporally at a constant frame rate and having an image format of 1280 pixels by 720 lines and an aspect ratio of 16:9 as given in table 1. All systems in the table have the common characteristic that all the samples gathered within a single temporal unit, a frame, shall be spatially contiguous and provide a complete description of that frame (4.2) This standard specifies: R G B color encoding; R G B analog and digital representation; Y P BP R color encoding, analog representation, and analog interface; and Y C BC R color encoding and digital representation. System nomenclature Luma or R G B samples per active line (S/AL) Table 1 Image sampling systems Active lines per frame (AL/F) Frame rate, Hz Luma or R G B sampling frequency (fs), MHz Luma sample periods per total line (S/TL) Total lines per frame 1 1280 720/60 1280 720 60 74.25 1650 750 2 1280 720/59.94 1280 720 60/1.001 74.25/1.001 1650 750 3 1280 720/50 1280 720 50 74.25 1980 750 4 1280 720/30 1280 720 30 74.25 3300 750 5 1280 720/29.97 1280 720 30/1.001 74.25/1.001 3300 750 6 1280 720/25 1280 720 25 74.25 3960 750 7 1280 720/24 1280 720 24 74.25 4125 750 8 1280 720/23.98 1280 720 24/1.001 74.25/1.001 4125 750 NOTE For systems 4 through 8, analog video interface is not preferred. See clause 12. Copyright 2001 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 Approved January 4, 2001

28 Rec. UIT-R BT.1616 SMPTE 296M-2001 Designers should be aware that serial digital interfaces for formats other than Y C BC R have not been defined. A bit-parallel digital interface is incorporated by reference in clause 10. NOTE Throughout this standard, references to signals represented by a single primed letter (e.g., R, G, and B ) are equivalent to the nomenclature in earlier documents of the form E R, E G, and E B, which in turn refer to signals to which the transfer characteristics in 5.4 have been applied. Such signals are commonly described as being gamma corrected. 1.2 This standard specifies multiple system formats (table 1). It is not necessary for an implementation to support all formats to be compliant with this standard. However, an implementation must state which of the system formats are supported. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standards listed below. SMPTE 274M-1998, Television 1920 1080 Scanning and Analog and Parallel Digital Interfaces for Multiple Picture Rates SMPTE 291M-1998, Television Ancillary Data Packet and Space Formatting SMPTE RP 160-1997, Three-Channel Parallel Analog Component High-Definition Video lnterface SMPTE RP 177-1993 (R1997), Derivation of Basic Television Color Equations CIE Publication 15.2 (1986), Colorimetry, Second Edition IEC 60169-8 (1978-01), Radio Frequency Connectors, Part 8: R.F. Coaxial Connectors with Inner Diameter of Outer Conductor 6.5 mm (0.256 in) with Bayonet Lock Characteristic Impedance 50 Ohms (Type BNC) plus amendments IEC 60169-8-am1 (1996-03) and IEC 60169-8-am2 (1997-11) ITU-R BT.709-4 (09/00), Parameter Values for the HDTV Standards for Production and International Programme Exchange 3 General 3.1 The specification of a system claiming compliance with this standard shall state: which of the systems of table 1 are implemented; which of the analog R G B or Y P BP R and/or which of the digital R G B or Y C BC R interfaces are implemented; and whether the digital representation employs eight bits or 10 bits per sample in its uniformly quantized (linear) PCM coding. 3.2 Digital codeword values in this standard are expressed as decimal values in the 10-bit representation. An eight-bit system shall either round or truncate to the most significant eight bits as specified in 7.10. 4 Timing 4.1 Timing shall be based on a reference clock of the sampling frequency indicated in table 1, which shall be maintained to a tolerance of ± 10 ppm. 4.2 A frame shall comprise the indicated total lines per frame, each line of equal duration as determined by the sampling frequency (fs) and the samples per total line (S/TL). Samples may be obtained in an optoelectronic conversion process sequentially, simultaneously, or via a combination of both, provided all samples in the frame are contiguous in the image and obtained within the same temporal frame period. The samples within each line shall be uniformly delivered to and collected from the interface in a spatially left-to-right sequence; lines in a frame shall be uniformly delivered to and collected from the interface in a spatially top-to-bottom sequence. Lines are numbered in time sequence according to the raster structure described in clause 6. 4.3 Timing instants in each line shall be defined with respect to a horizontal datum denoted by 0 H which is established by horizontal synchronizing (sync) information in clauses 8 and 11. Each line shall be Page 2 of 14 pages

Rec. UIT-R BT.1616 29 SMPTE 296M-2001 divided into a number of reference clock intervals, of equal duration, as specified by the column S/TL in table 1. The time between any two adjacent sample instants is called the reference clock interval T. T = 1/fs. 5 System colorimetry 5.1 Equipment shall be designed in accordance with the colorimetric analysis and optoelectronic transfer function defined in this clause. This corresponds to ITU-R BT.709. 5.2 Picture information shall be linearly represented by red, green, and blue tristimulus values (RGB), lying in the range 0 (reference black) to 1 (reference white), whose colorimetric attributes are based upon reference primaries with the following chromaticity coordinates, in conformance with ITU-R BT.709, and whose white reference conforms to CIE D 65 as defined by CIE 15.2: Red primary Green primary Blue primary Reference white CIE x 0.640 0.300 0.150 0.3127 CIE y 0.330 0.600 0.060 0.3290 5.3 From the red, green, and blue tristimulus values, three nonlinear primary components, R, G, and B, shall be computed according to the optoelectronic transfer function of ITU-R BT.709, where L denotes a tristimulus value and V denotes a nonlinear primary signal: V = 4.5L, 1.099L 0.45 0.099, 0 L< 0.018 0.018 L 1.0 5.4 To ensure the proper interchange of picture information between analog and digital representations, signal levels shall be completely contained in the range specified between reference black and reference white specified in 7.6 and 12.4, except for overshoots and undershoots due to processing. 5.5 The Y component shall be computed as a weighted sum of nonlinear R G B primary components, using coefficients calculated from the reference primaries according to the method of SMPTE RP 177: Y = 0.2126R + 0.7152G + 0.0722B NOTE Because the Y component is computed from nonlinear R G B primary components rather than from the linear tristimulus RGB values, it does not represent the true luminance value of the signal, but only an approximation. To distinguish it from luminance, the term luma is used for the Y signal. For more information, see e.g. Poynton, A Technical Introduction to Digital Video. 5.6 Color-difference component signals P B and P R, having the same excursion as the Y component, shall be computed as follows: P B = P R = 0.5 1 0.0722 ( B Y ) 0.5 1 0.2126 ( R Y ) P B and P R are filtered and may be coded as C B and C R components for digital transmission. Example filter templates are given in figure B.2. 6 Raster structure 6.1 For details of vertical timing, see figures 1 and 2. 6.2 In a system according to this standard, each frame shall comprise 750 lines including: Vertical blanking: lines 1 through 25 inclusive (including vertical sync, lines 1 through 5 inclusive) and lines 746 through 750 inclusive; and Picture: 720 lines, lines 26 through 745 inclusive. 6.3 Ancillary signals, as distinct from ancillary data, may be conveyed during vertical blanking, lines 7 through 25 inclusive. The portion within each of these lines that may be used for ancillary data is defined in 9.3. Ancillary signals shall not convey picture information although they may be employed to convey other related or unrelated signals, coded similarly to picture information. Further specification of ancillary signals is outside the scope of this standard. 6.4 During time intervals not otherwise used, the R, G, B or Y, P B, C B, P R, and C R components shall have a blanking level corresponding to zero. 6.5 The production aperture defines a region 1280 samples by 720 lines. The horizontal extent of the production aperture shall have the Page 3 of 14 pages

30 Rec. UIT-R BT.1616 SMPTE 296M-2001 FRAME 0 27 Picture Picture Picture Figure 1 Vertical timing (analog representation) FRAME Picture Picture Picture Figure 2 Vertical timing (digital representation) 50% point of its leading transition at reference luma sample 0 and the 50% point of its trailing transition at luma sample 1279. The production aperture defines the maximum extent of picture information. For further information, consult annex A. 6.6 The aspect ratio of the image represented by the production aperture shall be 16:9. The sample aspect ratio is 1:1 (square pixels). 6.7 The center of the picture shall be located at the center of the production aperture, midway between samples 639 and 640, and midway between lines 385 and 386. 6.8 Each edge of the picture width, measured at the 50% amplitude point, shall lie within six reference clock intervals of the production aperture. 7 Digital representation 7.1 Digital representation shall employ either R G B or Y C BC R components, as defined in clause 5 or clause 6, uniformly sampled. NOTE Each component is prepared as an individual channel. Combinations of channels may be presented to an appropriate interface for signal interchange. For example, the Y channel and the multiplexed C B/C R channel data together comprise a source format for the serial interface specified in SMPTE 292M. 7.2 The digital signals described here are assumed to have been filtered to reduce or prevent aliasing upon sampling. For information regarding filtering, consult annex B. 7.3 The characteristics of the digital signals are based on the assumption that the location of any required sin (x)/x correction is at the point where the signal is converted to an analog format. Page 4 of 14 pages

Rec. UIT-R BT.1616 31 SMPTE 296M-2001 7.4 R G B signals and the Y signal of the Y C BC R interface shall be sampled orthogonally, line- and picture-repetitive, at the sampling frequency, fs. The period of the sampling clock shall be denoted T. R G B samples shall be cosited with each other. 7.5 A luma sampling number in a line is denoted in this standard by a number from 0 through one less than the total number of samples in a line. Luma sample number zero shall correspond to the first active video sample. The luma sample numbering is shown in figure 3. Note that the distance between 0 H and the start of SAV is 256 samples. NOTE The active video digital representation is 1280 clock periods (0-1279) in length. 7.6 Digital R, G, B, and Y components shall be computed as follows: L D = Floor (219DL + 16D + 0.5); D = 2 n-8 where L is the component value in abstract terms from zero to unity, n takes the value 8 or 10 corresponding to the number of bits to be represented, and L D is the resulting digital code. The unary function Floor yields the largest integer not greater than its argument. NOTE This scaling places the extrema of R, G, B, and Y components at codewords 64 and 940 in a 10-bit representation or codewords 16 and 235 in an eight-bit representation. 0 H Analog Waveform (Y R G B ) Durations in References Clock Periods (T) 4T A.T 40T 256T B.T 40T C.T 4T 1280T Luma Sample Numbering Digital Data Stream p abcde f ghi j klmno p abcd 4T BT 4T 1280T ANCILLARY DATA or EAV SAV VIDEO DATA (EAV) BLANKING CODEWORDS Duration in ref. Clock periods NOTES 1 Horizontal axis not to scale. 2 0 H is the analog horizontal timing reference point, and in the analog domain, is regarded as the start of the line. 3 A line of digital video extends from the first word of EAV to the last word of video data. Figure 3 Analog and digital timing relationships Page 5 of 14 pages

32 Rec. UIT-R BT.1616 SMPTE 296M-2001 7.7 Digital C B and C R components of the Y C BC R set shall be computed as follows: C D = Floor (224DC + 128D + 0.5); D = 2 n-8 where C is the component value in abstract terms from 0.5 to + 0.5, and C D is the resulting digital code. The unary function Floor yields the largest integer not greater than its argument. NOTE This scaling places the extrema of C B and C R at codewords 64 and 960 in a 10-bit representation or codewords 16 and 240 in an eight-bit representation. 7.8 C B and C R signals shall be horizontally subsampled by a factor of two with respect to the Y component. C B and C R samples shall be cosited with even-numbered Y samples. The sample number zero of C B and C R corresponds to the first active video 0 sample. For information regarding filtering, consult annex B. The subsampled C B and C R signals shall be timemultiplexed on a sample basis, in the order C BC R. The first data word of an active line shall be a C B sample. The multiplexed signal is referred to as C B/C R. NOTE Systems 7 and 8 have 2063 C B sample periods and 2062 C R sample periods per line. The C B/C R multiplexer must be reset every line at sample number zero. 7.9 Code values having the eight most significant bits all zero or all one that is, 10-bit codes 0, 1, 2, 3, 1020, 1021, 1022, and 1023 are employed for synchronizing purposes and shall be prohibited from video, ancillary signals, and ancillary data. 7.10 A system having an eight-bit interface shall address the conversion of 10-bit video data to eight bits with an appropriate process that minimizes video artifacts such as quantization noise. Ancillary data in 10-bit format shall be converted to eight-bit format by truncating the two least significant bits. In both cases, when converting eight-bit data to 10-bit data, the two least significant bits of the 10-bit word shall be set to 0. NOTE SMPTE is addressing rounding for all eight-bit/10- bit digital video standards. SMPTE 291M describes the handling of ancillary data between eight-bit and 10-bit interfaces in annex D. 7.11 For Y, R, G, and B signals, undershoot and overshoot in video processing may be accommodated by the use of codewords 4 through 63 and codewords 941 through 1019 in a 10-bit system, or codewords 1 through 15 and codewords 236 through 254 in an eight-bit system. For C B and C R signals, undershoot and overshoot in video processing may be accommodated by the use of codewords 4 through 63 and codewords 961 through 1019 in a 10-bit system, or codewords 1 through 15 and codewords 241 through 254 in an eight-bit system. 8 Digital timing reference sequences (SAV, EAV) 8.1 SAV (start of active video) and EAV (end of active video) digital synchronizing sequences shall define synchronization across the digital interface. Figures 2, 3, and 4 show the relationship of the SAV and EAV sequences to digital and analog video. 8.2 An SAV or EAV sequence shall comprise four consecutive codewords: a codeword of all ones, a codeword of all zeros, another codeword of all zeros, and a codeword including F (frame), V (vertical), H (horizontal), P3, P2, P1, and P0 (parity) bits. An SAV sequence shall be identified by having H = 0; EAV shall have H = 1 (tables 3 and 4 show details of the coding). 8.3 When digitized, every line shall include a four-sample EAV sequence commencing 110 clocks prior to 0 H (for systems 1 and 2); 440 clocks prior to 0H (for system 3); 1760 clocks prior to 0H (for systems 4 and 5); 2420 clocks prior to 0H (for system 6);and 2585 clocks prior to 0H (for systems 7 and 8). When digitized, every line shall include a four-sample SAV sequence commencing 256 clocks after 0H (for all systems [1, 2, 3, 4, 5, 6, 7, and 8]). The EAV sequence immediately preceding the 0H datum of line 1 shall be considered to be the start of the digital frame as shown in figure 2. Page 6 of 14 pages